Sol-gel coating compositions including corrosion inhibitor-encapsulated layered double hydroxide and related processes
a technology of layered double hydroxide and coating composition, which is applied in the direction of coatings, anti-corrosion paints, special surfaces, etc., can solve the problems of hexavalent chromium compounds having harmful effects, prone to corrosion of alloys, and localized corrosion, and achieves enhanced adhesion
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example 1
[0069]For a vanadate-based corrosion inhibiting material, 400 ml of sodium metavanadate (NaVO3) solution having a concentration of about 0.1 M was prepared. The pH of this solution was adjusted to a pH ranging from about 8 to about 9 by addition of a NaOH solution having a concentration of about 2.0 M. To this, 10 g of a Zn—Al LDH composition was added with continuous stirring. Stirring was continued for 24 h. The powder was centrifuged after 24 h, washed with hot water until the pH of the supernatant was neutral, and followed by drying the vanadate-exchanged Zn—Al LDH composition at 60° C. for a time period ranging from about 3 to about 4 h in a drying oven. Similarly, different corrosion inhibiting materials were prepared by using a number of different molecules such as 2-mercaptobenzothiazole, benzotriazole, 1,3,4-thiadiazole-2,5-dithiol, 1-methyl-1-tetrazole-5-thiol, 4-methyl-4H-1,2,4-triazole-3-thiol, 8-hydroxyquinoline, phytic acid, an organophosphonic acid, and linseed oil as...
example 2
[0074]A solution of 104.1 g of Zn(NO3)2.6H2O dissolved in 25 ml water and a solution of 65.6 g of Al(NO3)3.9H2O dissolved in 25 ml water was mixed under vigorous stirring under N2 purging. To this mixture, 87.5 ml of a NaNO3 solution having a concentration of about 0.1 M, adjusted to pH 10, was added drop-wise and maintained at a pH of about 10 by adding a NaOH having a concentration of about 2.0 M. A fluffy LDH white precipitate was formed. Once the addition was complete, the entire mixture was stirred vigorously under N2 purging for 12 h. The precipitate was centrifuged at 6500 rpm and washed about 3 or 4 times with hot water (at 80° C.), followed by drying at 65° C. for 24 h. A Zn—Al LDH composition in the form of a powder was formed.
[0075]FIG. 3 illustrates an example process 300 for preparing a sol-gel composition. A low temperature curable matrix sol is synthesized in two parts (composition A and composition B), the two parts are mixed together, additional compounds are added ...
example 3
[0112]Composition A was synthesized by mixing 171.5 g of 3-methacryloxypropyltrimethoxysilane and 17.0 g of water in a glass jar loaded on a magnetic stirrer. 5.5 grams of 0.1 N HCl was further added to the mixture. The solution was stirred in an ice bath till the solution turned transparent. Although 3-methacryloxypropyltrimethoxysilane was used in this example, one or more other alkoxysilanes of Formula I may be used in place of, or in addition to, 3-methacryloxypropyltrimethoxysilane in other examples. Also, although HCl was used in this example, one or more other inorganic acids may be used in place of, or in addition to, HCl in other examples.
[0113]Composition B was synthesized by mixing 11.8 g of methacrylic acid and 45.2 g of zirconium n-propoxide under vigorous stirring. Stirring was continued for about 2 h. Although zirconium n-propoxide was used in this example, one or more other zirconium alkoxides of Formula II may be used in place of, or in addition to, zirconium n-prop...
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